The article says it’s a 2002 laptop and says it would have been “significantly out of date” when Half-Life 2 launched. Half-Life 2 launched in 2004. So that’s 2 years. He’s also reduced the resolution to 512x512 - less than half the original resolution - and hasn’t recreated several of the lighting effects.
I don’t know what unoptimised games this is supposed to be a middle finger to specifically, but it strikes me that it wouldn’t be considered particularly out of the ordinary to find a modern game that could run on a 2023 machine at less than half resolution and with significantly reduced lighting effects.